Some of this is from the
Lowest Bidder mentality.
Most BPH have house styles.
Looking at what was delivered to the end user shows the coder had little clue and just used the first selection that gave 'the look'. Whole books using 'frontmatter' styles
The there is Baen, where every chapter is nested in another DIV (30 Chapters are nested in 30 Divs.
) I have a saved
Baen_deDiv S&R which I run as many times as needed until the
changed results = 0
In the end, the book looks no different to the reader